CN112879422B - Novel combined thrust bearing group for downhole motor - Google Patents
Novel combined thrust bearing group for downhole motor Download PDFInfo
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- CN112879422B CN112879422B CN202110156233.0A CN202110156233A CN112879422B CN 112879422 B CN112879422 B CN 112879422B CN 202110156233 A CN202110156233 A CN 202110156233A CN 112879422 B CN112879422 B CN 112879422B
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- bearing
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- gasket
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- ring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C21/00—Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/06—Bearing arrangements
- F03B11/063—Arrangements for balancing axial thrust
- F03B11/066—Arrangements for balancing axial thrust in vertical axis machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/26—Systems consisting of a plurality of sliding-contact bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/583—Details of specific parts of races
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a novel combined thrust bearing group for a downhole motor, and relates to the technical field of downhole motors in drilling engineering; the bearing comprises a plurality of groups of PDC bearings which are sequentially and vertically arranged, wherein the lower end of the PDC bearing positioned at the lowermost part is connected with a plurality of groups of arc raceway bearings which are sequentially and vertically arranged; the lower end part of the arc raceway bearing positioned at the lowest part is connected with a lower radial bearing inner ring and a lower radial bearing outer ring which are nested; the upper end part of the PDC bearing positioned at the uppermost part is connected with an upper radial bearing inner ring and an upper radial bearing outer ring which are nested; the outer sides of the PDC bearing and the arc raceway bearing are provided with a shaft bottom power drilling tool shell, a shaft bottom power shaft system penetrates through the shaft bottom power drilling tool shell, and the PDC bearing and the arc raceway bearing are located between the shaft bottom power drilling tool shell and the shaft bottom power shaft system. The novel combined thrust bearing group for the downhole motor increases the service life of the entire downhole motor (particularly a turbine drilling tool) and reduces the cost.
Description
Technical Field
The invention relates to the technical field of downhole motors in drilling engineering, in particular to a novel combined thrust bearing group for a downhole motor.
Background
Downhole motors, especially turbine motors (also called turbo drilling tools), in drilling engineering are key tools for increasing the speed of oil and gas drilling (including conventional petroleum and natural gas, shale gas, natural gas hydrate, and the like), geothermal drilling, hot dry rock drilling, scientific drilling, and the like. The turbine is a downhole motor that converts fluid energy into mechanical energy, typically at output speeds up to hundreds to thousands of revolutions per minute.
To reduce the extra work of tripping, downhole motors (including turbine tools) are generally required to have as high a useful life and reliability as possible. The thrust bearing set with the output end bearing the axial load is a key component determining the reliability and the service life of the turbine drilling tool, and countries are dedicated to research and development work of the thrust bearing set for decades. The service life of a common thrust ball bearing group is very short under the severe working conditions of high rotating speed, high solid-phase slurry environment, large axial load and dynamic load of a drilling project, and the use of a turbine drilling tool is restricted.
Disclosure of Invention
The invention aims to provide a novel combined thrust bearing group for a downhole motor, which is used for solving the problems in the prior art, prolonging the service life of the entire downhole motor (particularly a turbine drilling tool) and reducing the cost.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a novel combined thrust bearing group for a downhole motor, which comprises a plurality of groups of PDC bearings which are sequentially and vertically arranged, wherein the lower end of the PDC bearing positioned at the lowest part is connected with a plurality of groups of arc raceway bearings which are sequentially and vertically arranged; the lower end part of the arc raceway bearing positioned at the lowest part is connected with a lower radial bearing inner ring and a lower radial bearing outer ring which are nested; the upper end part of the PDC bearing positioned at the uppermost part is connected with an upper radial bearing inner ring and an upper radial bearing outer ring which are nested; and a bottom hole power drilling tool shell is arranged outside the PDC bearing and the arc raceway bearing, a bottom hole power shaft system penetrates through the bottom hole power drilling tool shell, and the PDC bearing and the arc raceway bearing are positioned between the bottom hole power drilling tool shell and the bottom hole power shaft system.
Optionally, the PDC bearing includes a static gasket and a dynamic gasket which are arranged vertically and symmetrically; the outer side of the bottom of the static gasket is fixedly connected with a static gasket, and the outer diameter of the static gasket is the same as that of the static gasket; the inner side of the top of the movable gasket is fixedly connected with a movable gasket, and the inner diameter of the movable gasket is the same as that of the movable gasket; the bottom of the static gasket is fixedly connected with a PDC bearing static ring, the top of the dynamic gasket is connected with a PDC bearing dynamic ring through an adjusting gasket, two PDC blocks are arranged between the PDC bearing static ring and the PDC bearing dynamic ring, one ends of the two PDC blocks are respectively and fixedly connected with the PDC bearing static ring and the PDC bearing dynamic ring, and the other end faces of the two PDC blocks are in contact and relatively connected in a sliding manner; the PDC bearing static ring and the PDC bearing moving ring are coaxially arranged; the top end face of the movable gasket and the top end face of the static gasket are located on the same horizontal plane, and the bottom end face of the static gasket and the bottom end face of the movable gasket are located on the same horizontal plane.
Optionally, the circular arc raceway bearing comprises a ball bearing inner raceway which is the same as the inner diameter of the movable gasket, a ball bearing outer raceway which is the same as the outer diameter of the static gasket is sleeved outside the ball bearing inner raceway, symmetrical arc grooves are formed between the ball bearing inner raceway and the ball bearing outer raceway, and bearing steel balls are arranged in the arc grooves.
Compared with the prior art, the invention has the following technical effects:
the invention provides a novel combined thrust bearing set for a downhole motor, which comprises an upper PDC bearing set and a lower arc raceway bearing set which are connected in series. Because the wear rate of the arc raceway bearing is far higher than that of a PDC plane bearing manufactured by diamond, the PDC plane bearing and the arc raceway bearing are worn alternately in normal drilling, but the PDC bearing is used for bearing most of time, and the overall service life of the drilling tool is ensured. Because the impact resistance of the PDC block is far lower than that of the arc raceway bearing, when vibration occurs, the arc raceway bearing bears impact load, so that the adaptability to complex working conditions can be greatly improved, and the reliability is improved. The bottom motor mainly bears the axial load with the upward bottom, the PDC bearing only needs to bear the axial load with the upward bottom, the downward load is not needed to be considered when the drilling tool is suspended, half of the using amount of PDC plane bearing rings can be reduced, and the cost is effectively reduced (the price of the PDC bearing is far higher than that of an arc raceway bearing). In the initial stage of the drilling tool starting to work, when the small drilling pressure grinding is adopted, the two bearings are stressed alternately, the grinding of the PDC bearing group is facilitated, and the uniform loading of each pair of PDC bearings is achieved when the drilling tool enters normal drilling.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic illustration of the present invention installed in a downhole power support section;
FIG. 2 is a schematic view of the novel combination thrust bearing assembly for a downhole motor of the present invention;
FIG. 3 is a schematic view of a unidirectional PDC bearing pack of the present invention;
wherein 100 is a novel combined thrust bearing group for a downhole motor; 1-1 is a ball bearing outer raceway; 1-2 is a ball bearing inner raceway; 1-3 are bearing steel balls; 2-1 is a movable gasket; 2-2 is a static gasket; 2-3 is an adjusting gasket; 2-4 is a PDC bearing moving coil; 2-5 is a PDC bearing static ring; 2-6 is a movable gasket; 2-7 are static gaskets; 3-1 is an upper radial bearing outer ring; 3-2 is an inner ring of the upper radial bearing; 3-3 is the casing of the well bottom power drilling tool; 3-4 is a shaft bottom power shaft system; 3-5, an outer ring of the lower radial bearing; 3-6 are lower radial bearing inner rings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a novel combined thrust bearing group for a downhole motor, which is used for solving the problems in the prior art, prolonging the service life of the entire downhole motor (particularly a turbine drilling tool) and reducing the cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The PDC plane bearing has been developed in recent years, has reached the purpose that increases turbine drilling tool complete machine life-span by a wide margin through reasonable in design PDC bearing group, and PDC bearing group has two big core problems: firstly, the axial load of several tons to tens of tons in the well is born, a pair of PDC bearings cannot be independently completed, several pairs or even more than ten pairs of PDC bearings are required to be connected in parallel according to different working conditions, and each pair of bearings bear the axial load of 1/N; secondly, the parallel bearing group needs to bear the same pre-tightening load on each pair of bearings during assembly, but the parts have tolerance in the processing and assembly processes, so the problem needs to be solved structurally, and in addition, the structure more importantly distributes the dynamic load on each pair of bearings during the drilling process. In addition, the PDC bearing ring is expensive and is an arc raceway bearing, that is, the price of the thrust ball bearing is tens of times or even hundreds of times (the price of one set of arc raceway bearing set is within 5000 yuan, and the price of one set of PDC bearing set can be as high as hundreds of thousands or even more), and the cost reduction is also one of the core works of the design of the thrust bearing of the turbine drilling tool. Based on the technical scheme, the invention designs the following technical scheme.
As shown in fig. 1-3, the present invention provides a novel combined thrust bearing set 100 for a downhole motor, which comprises a plurality of PDC bearings vertically arranged in sequence, wherein the lower end of the PDC bearing located at the lowest part is connected with a plurality of circular arc raceway bearings vertically arranged in sequence; the lower end part of the arc raceway bearing positioned at the lowest part is connected with a lower radial bearing inner ring 3-6 and a lower radial bearing outer ring 3-5 which are nested; the upper end part of the PDC bearing positioned at the uppermost part is connected with an upper radial bearing inner ring 3-2 and an upper radial bearing outer ring 3-1 which are nested; the outer sides of the PDC bearing and the arc raceway bearing are provided with a bottom hole power drilling tool shell 3-3, a bottom hole power shaft system 3-4 penetrates through the bottom hole power drilling tool shell 3-3, the PDC bearing and the arc raceway bearing are positioned between the bottom hole power drilling tool shell 3-3 and the bottom hole power shaft system 3-4, and the bottom hole power shaft system 3-4 is respectively connected with a plurality of groups of PDC bearings and arc raceway bearings.
Preferably, the PDC bearing comprises a static gasket 2-7 and a dynamic gasket 2-1 which are symmetrically arranged up and down; the outer side of the bottom of the static gasket 2-7 is fixedly connected with a static gasket 2-2, and the outer diameter of the static gasket 2-2 is the same as that of the static gasket 2-7; the inner side of the top of the movable gasket 2-1 is fixedly connected with a movable gasket 2-6, and the inner diameter of the movable gasket 2-1 is the same as that of the movable gasket 2-2; the bottom of the static gasket 2-7 is fixedly connected with a PDC bearing static ring 2-5, the top of the dynamic gasket 2-1 is connected with a PDC bearing moving ring 2-4 through an adjusting gasket 2-3, two PDC blocks are arranged between the PDC bearing static ring 2-5 and the PDC bearing moving ring 2-4, one ends of the two PDC blocks are respectively and fixedly connected with the PDC bearing static ring 2-5 and the PDC bearing moving ring 2-4, the other end faces of the two PDC blocks are in contact and relatively in sliding connection, the PDC blocks are polycrystalline diamonds and have ultrahigh hardness and wear resistance, and the PDC bearing static ring 2-5 and the PDC bearing moving ring 2-4 are coaxially arranged; the top end face of the movable gasket 2-6 and the top end face of the static gasket 2-7 are positioned on the same horizontal plane, and the bottom end face of the static gasket 2-2 and the bottom end face of the movable gasket 2-1 are positioned on the same horizontal plane.
The arc raceway bearing comprises a ball bearing inner raceway 1-2 with the same inner diameter size as the movable gasket 2-1, a ball bearing outer raceway 1-1 with the same outer diameter size as the static gasket 2-7 is sleeved outside the ball bearing inner raceway 1-2, symmetrical arc grooves are formed between the ball bearing inner raceway 1-2 and the ball bearing outer raceway 1-1, and bearing steel balls 1-3 are arranged in the arc grooves.
In the description of the present invention, it should be noted that the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (1)
1. A novel combined thrust bearing group for a downhole motor is characterized in that: the device comprises a plurality of groups of PDC bearings which are sequentially and vertically arranged, wherein the lower end of the PDC bearing positioned at the lowermost part is connected with a plurality of groups of arc raceway bearings which are sequentially and vertically arranged; the lower end part of the arc raceway bearing positioned at the lowest part is connected with a lower radial bearing inner ring and a lower radial bearing outer ring which are nested; the upper end part of the PDC bearing positioned at the uppermost part is connected with an upper radial bearing inner ring and an upper radial bearing outer ring which are nested; a bottom hole power drilling tool shell is arranged outside the PDC bearing and the arc raceway bearing, a bottom hole power shaft system penetrates through the bottom hole power drilling tool shell, and the PDC bearing and the arc raceway bearing are positioned between the bottom hole power drilling tool shell and the bottom hole power shaft system; the PDC bearing comprises a static gasket and a dynamic gasket which are arranged up and down symmetrically; the outer side of the bottom of the static gasket is fixedly connected with a static gasket, and the outer diameter of the static gasket is the same as that of the static gasket; the inner side of the top of the movable gasket is fixedly connected with a movable gasket, and the inner diameter of the movable gasket is the same as that of the movable gasket; the bottom of the static gasket is fixedly connected with a PDC bearing static ring, the top of the dynamic gasket is connected with a PDC bearing dynamic ring through an adjusting gasket, two PDC blocks are arranged between the PDC bearing static ring and the PDC bearing dynamic ring, one ends of the two PDC blocks are respectively and fixedly connected with the PDC bearing static ring and the PDC bearing dynamic ring, and the other end faces of the two PDC blocks are in contact and relatively connected in a sliding manner; the PDC bearing static ring and the PDC bearing moving ring are coaxially arranged; the top end face of the movable gasket and the top end face of the static gasket are positioned on the same horizontal plane, and the bottom end face of the static gasket and the bottom end face of the movable gasket are positioned on the same horizontal plane; the circular arc raceway bearing comprises a ball bearing inner raceway which is the same as the inner diameter of the movable gasket, a ball bearing outer raceway which is the same as the outer diameter of the static gasket is sleeved outside the ball bearing inner raceway, symmetrical arc grooves are formed between the ball bearing inner raceway and the ball bearing outer raceway, and bearing steel balls are arranged in the arc grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110156233.0A CN112879422B (en) | 2021-02-04 | 2021-02-04 | Novel combined thrust bearing group for downhole motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110156233.0A CN112879422B (en) | 2021-02-04 | 2021-02-04 | Novel combined thrust bearing group for downhole motor |
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| Publication Number | Publication Date |
|---|---|
| CN112879422A CN112879422A (en) | 2021-06-01 |
| CN112879422B true CN112879422B (en) | 2022-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110156233.0A Active CN112879422B (en) | 2021-02-04 | 2021-02-04 | Novel combined thrust bearing group for downhole motor |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1491766A (en) * | 1975-06-17 | 1977-11-16 | Inst Burovoi Tekhnik | Thrust support for a fluid motor used in drilling wells |
| CN1090631A (en) * | 1992-10-28 | 1994-08-10 | Csir公司 | Diamond bearing assembly |
| CN2551753Y (en) * | 2002-07-10 | 2003-05-21 | 石油大学(北京) | Oil Storage compensation simple sealed drive shaft with multiple rows of thrust ball bearing |
| CN1502782A (en) * | 2002-11-22 | 2004-06-09 | 石油大学(北京) | Transmission shaft with metal rubber thrust bearing and rolling bearnig for downhole power drill |
| US7104698B1 (en) * | 1999-02-03 | 2006-09-12 | Rotech Holdings, Ltd. | Thrust bearing for down-hole tool |
| CN101245807A (en) * | 2008-01-25 | 2008-08-20 | 西南石油大学 | Long-life high-performance screw drill transmission shaft bearing |
| CN201461727U (en) * | 2009-06-18 | 2010-05-12 | 巩立根 | Polycrystalline diamond sliding thrust bearing assembly |
| CN104675324A (en) * | 2015-03-04 | 2015-06-03 | 中国海洋石油总公司 | PDM (positive displacement motor) drilling tool for well drilling |
-
2021
- 2021-02-04 CN CN202110156233.0A patent/CN112879422B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1491766A (en) * | 1975-06-17 | 1977-11-16 | Inst Burovoi Tekhnik | Thrust support for a fluid motor used in drilling wells |
| CN1090631A (en) * | 1992-10-28 | 1994-08-10 | Csir公司 | Diamond bearing assembly |
| US7104698B1 (en) * | 1999-02-03 | 2006-09-12 | Rotech Holdings, Ltd. | Thrust bearing for down-hole tool |
| CN2551753Y (en) * | 2002-07-10 | 2003-05-21 | 石油大学(北京) | Oil Storage compensation simple sealed drive shaft with multiple rows of thrust ball bearing |
| CN1502782A (en) * | 2002-11-22 | 2004-06-09 | 石油大学(北京) | Transmission shaft with metal rubber thrust bearing and rolling bearnig for downhole power drill |
| CN101245807A (en) * | 2008-01-25 | 2008-08-20 | 西南石油大学 | Long-life high-performance screw drill transmission shaft bearing |
| CN201461727U (en) * | 2009-06-18 | 2010-05-12 | 巩立根 | Polycrystalline diamond sliding thrust bearing assembly |
| CN104675324A (en) * | 2015-03-04 | 2015-06-03 | 中国海洋石油总公司 | PDM (positive displacement motor) drilling tool for well drilling |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112879422A (en) | 2021-06-01 |
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